US4696002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resetting circuit for microprocessors
Assignee: Robert Bosch GmbH
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Filing: 1985-03-20
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Granted: 1987-09-22
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Expires: 2005-03-20
Abstract
Abstract A reset circuit is suggested for a microprocessor with which the microprocessor is reset, if the predetermined program ranges are left. During each cyclical input signal it is determined whether an output signal appears after a predetermined time. If this is not the case the reset process is performed. The reset process is also initiated if a predetermined output of the microprocessor remains in a defined position over an unduly long time.
Inventors
- 👤 Richard Schleupen
- 👤 Ulrich Mayer
- 👤 Bernhard Bauer
- 👤 Arnd M. Langner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:00
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/0703; G06F11/0751; G06F11/0754; G06F11/0757; G06F1/00; G06F1/24; G06F11/14; G06F11/1402; G06F11/1415
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
In a reset circuit for a microprocessor, in particular for a micro-processor for controlling systems in motor vehicles, said microprocessor being cyclically fed from a system to be controlled by input signals fed at an input of said microprocessor, said microprocessor having an output at which output signals are emitted, the improvement comprising means for receiving and combining said input signals with said output signals, said means (17 to 20, 40 to 43, 50 to 55) being connected to said input and output, respectively, and generating reset signals for said microprocessor if a predetermined output signal at said output of the microprocessor does not follow a switching signal of the cyclically fed signals.
Claim 2
Dependent Claim
113 words
In a reset circuit for a microprocessor, in particular for a micro-processor for controlling systems in motor vehicles, said microprocessor being cyclically fed from a system to be controlled by input signals fed at an input of said microprocessor, said microprocessor having an output at which output signals are emitted, the improvement comprising means for receiving and combining said input signals with said output signals, said means (17 to 20, 40 to 43, 50 to 55) being connected to said input and output, respectively, and generating reset signals for said microprocessor if a predetermined output signal at said output of the microprocessor does not follow a switching signal of the cyclically fed signals.
Claim 3
Dependent Claim
25 words
Reset circuit in accordance with claim 1, further including a switch (16) connected to said input to supress the reset signals for a short time.
Claim 4
Dependent Claim
29 words
Reset circuit in accordance with claim 2, including means operative to arrest the switch (16) for a predetermined time when a signal to be fed to said microprocessor appears.
Claim 5
Dependent Claim
51 words
Reset circuit in accordance with claim 1, wherein said microprocessor has a further output (PC5), and wherein the reset signals are generated if, after a switching signal of the cyclically fed signals, at least said further output (PC5) of the microprocessor remains longer in a predetermined position than a predetermined time.
Claim 6
Dependent Claim
48 words
Reset circuit in accordance with claim 1, further including a condenser (24) connected to said microprocessor, and resistors (23, 25, 26) connected to said condensor, and wherein a reset pulse is triggered by charging or discharging of said condenser (24) by means of said resistors (23, 25, 26).
Claim 7
Dependent Claim
30 words
Reset circuit in accordance with claim 5, further including diodes (28) connected to said resistors so that the resistors are bridgeable, at least partially, by means of said diodes (28).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-21 | 1991-03-23 | 1991-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-21 | 1995-03-23 | 1995-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-21 | 1999-03-23 | 1999-09-22 | $7700.00 | Window Closed / Lapsed |